Its down to your surgeon opinion, your stats; height weight etc, the look you’d like to achieve as what best suits your body!:)
They say unders are a more natural look but there are lots of ladies with overs that still look very natural! Your best bet would be to discuss with a surgeo what would be best for you! They know best they’re the professionals and are all soo good what heir job!:D hope this helps chick!xx